bs4.FeatureNotFound: Couldn't find a tree builder with the features you requested: lxml. Do you need
遇到一個奇葩的問題，我已經安裝了lxml，但是執行程式一直報bs4.FeatureNotFound: Couldn’t find a tree builder with the features you requested: lxml. Do you need to install a parser library?
最後解決辦法：將BeautifulSoup（html,‘lxml’）改成：BeautifulSoup(html, ‘html5lib’)
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